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Glossary

Base pair

A base pair is the combination of two nucleotides whose bases are bonded with each other
and lie on opposing strands of a DNA molecule. Adenine bonds with thymine, whereas cytosine
bonds with guanine, as shown in the figure below (illustrating Watson-Crick base pairing).

During transcription and translation, RNA is involved in base pairing interactions,
in which case uracil replaces thymine, and so the base pair AU is formed instead of AT.
This base pair can also arise during RNA folding.

Rosalind uses the abbreviation "bp" as a base pair unit to measure the length of a
strand of DNA; 1 bp corresponds to approximately 3.4 angstroms.

The practical purpose of DNA base pairing is to protect the vital DNA molecule
from foreign bonding, which could disrupt transcription. As a result, many researchers
believe that DNA actually evolved from RNA.